WO2023000937A1 - Dispositif de projection et procédé de correction d'image projetée - Google Patents

Dispositif de projection et procédé de correction d'image projetée Download PDF

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Publication number
WO2023000937A1
WO2023000937A1 PCT/CN2022/102067 CN2022102067W WO2023000937A1 WO 2023000937 A1 WO2023000937 A1 WO 2023000937A1 CN 2022102067 W CN2022102067 W CN 2022102067W WO 2023000937 A1 WO2023000937 A1 WO 2023000937A1
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WIPO (PCT)
Prior art keywords
black
controller
image
frame
video
Prior art date
Application number
PCT/CN2022/102067
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English (en)
Chinese (zh)
Inventor
肖纪臣
梁倩
郑晴晴
吴超
唐甜甜
Original Assignee
青岛海信激光显示股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN202110825818.7A external-priority patent/CN115695740A/zh
Priority claimed from CN202110825816.8A external-priority patent/CN115691365A/zh
Priority claimed from CN202111567322.0A external-priority patent/CN114339174B/zh
Application filed by 青岛海信激光显示股份有限公司 filed Critical 青岛海信激光显示股份有限公司
Publication of WO2023000937A1 publication Critical patent/WO2023000937A1/fr

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
    • H04N21/4363—Adapting the video stream to a specific local network, e.g. a Bluetooth® network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]

Definitions

  • the present disclosure relates to the field of projection technology, and in particular, to a projection device and a correction method for a projected image.
  • the projection technology is an optical projection technology from a point light source to a surface display.
  • the corresponding projection host location, screen location, screen flatness, optical distortion and other objective issues determine that the actual projection screen is difficult to directly match the screen completely.
  • some embodiments of the present disclosure provide a projection device, including: a light source assembly, an optical engine, a lens, and a circuit system architecture.
  • a light source assembly configured to provide an illumination beam.
  • the light engine is configured to modulate the illumination beam with the image signal to obtain the projection beam.
  • the lens is configured to project the projection beam into an image.
  • the circuit system architecture is configured to control the light source component and the optical machine operation; wherein the circuit system architecture includes: a first controller and a second controller, the first controller is coupled to the second controller, and the first controller is configured to : receiving a video switching instruction; in response to the video switching instruction, sending a black field video to the second controller, the black field video including a plurality of black frames and a plurality of positioning frames, and the positioning frames are used to assist the projection device in image correction.
  • the second controller is configured to receive the black field video, and control the light source component and the light machine to play the black field video.
  • some embodiments of the present disclosure provide a projection device, including: a light source assembly, an optical engine, a lens, a circuit system architecture, and a detection device.
  • the light source assembly is configured to provide an illumination beam.
  • the light machine is configured to modulate the illumination beam with the image signal to obtain the projection beam.
  • the lens is configured to project the projection beam into an image.
  • the detection device is configured to detect whether there is a target object within the target range, and generate a detection signal based on the detection result.
  • a circuit system architecture configured to control light source components and optomechanical operations. Wherein, the circuit system architecture includes: a power supply circuit, coupled with the light valve driving circuit and the light source driving circuit, and configured to supply power to the light valve driving circuit and the light source driving circuit.
  • the first controller coupled with the second controller, is configured to send a standby command to the second controller in response to the standby operation, and control the power supply circuit to keep the state of supplying power to the second controller unchanged.
  • the second controller is configured to, in response to the standby instruction, control the power supply circuit to maintain the state of supplying power to the light valve drive circuit, and control the power supply circuit to stop supplying power to the light source drive circuit; if it is determined based on the detection signal that there is a target object within the target range , the power supply circuit is controlled to supply power to the light source driving circuit, and the image signal of the standby image is sent to the light valve driving circuit.
  • the light source driving circuit is configured to drive the light source to provide the illumination light beam in response to the image signal of the standby image.
  • the light valve drive circuit is configured to respond to the image signal of the standby image, and drive the light engine to modulate the illumination beam by using the image signal of the standby image to obtain the projection beam.
  • some embodiments of the present disclosure provide a projection system, including a projection screen and the above-mentioned projection device.
  • some embodiments of the present disclosure provide a method for correcting a projected image, including: receiving a video switching instruction.
  • play a black field video the black field video includes a plurality of black frames and a plurality of positioning frames, and the positioning frames are used to assist the projection device to perform image correction.
  • the captured image is acquired, where the captured image is an image captured when the positioning frame is projected onto the projection screen. Based on the captured images, correction parameters are determined. Correct the image to be projected according to the correction parameters.
  • FIG. 1A is a schematic diagram of a projection system according to some embodiments of the present disclosure.
  • FIG. 1B is a structural diagram of a projection device according to some embodiments of the present disclosure.
  • FIG. 2 is a schematic diagram of a light source assembly, an optical engine and a lens in a projection device according to some embodiments of the present disclosure
  • FIG. 3 is a structural diagram of an optical path in a projection device according to some embodiments of the present disclosure.
  • Fig. 4 is a schematic diagram of the principle of an optical path of a light source assembly in a projection device according to some embodiments of the present disclosure
  • FIG. 5 is an arrangement structure diagram of tiny mirror mirrors in a digital micromirror device according to some embodiments of the present disclosure
  • Fig. 6 is a schematic diagram of the operation of a tiny mirror according to some embodiments of the present disclosure.
  • Fig. 7 is a schematic diagram of the position of a tiny mirror swing in the digital micromirror device shown in Fig. 5;
  • FIG. 8 is a structural diagram of another projection device according to some embodiments of the present disclosure.
  • FIG. 9 is a schematic diagram of the composition of a projection device according to some embodiments of the present disclosure.
  • FIG. 10 is a structural diagram of another projection device according to some embodiments of the present disclosure.
  • FIG. 11 is a structural diagram of another projection device according to some embodiments of the present disclosure.
  • Fig. 12 is a schematic diagram of a black frame and an alignment frame according to some embodiments of the present disclosure.
  • Fig. 13 is a schematic diagram of a positioning frame according to some embodiments of the present disclosure.
  • Fig. 14 is a schematic diagram of another positioning frame according to some embodiments of the present disclosure.
  • Fig. 15 is a schematic diagram of another positioning frame according to some embodiments of the present disclosure.
  • Fig. 16 is a schematic composition diagram of a black field video according to some embodiments of the present disclosure.
  • Fig. 17 is a schematic composition diagram of another black field video according to some embodiments of the present disclosure.
  • Fig. 18 is a flowchart of a method for correcting a projected image according to some embodiments of the present disclosure
  • Fig. 19 is a flow chart of another method for correcting a projected image according to some embodiments of the present disclosure.
  • first and second are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as “first” and “second” may explicitly or implicitly include one or more of these features. In the description of the present disclosure, unless otherwise specified, "plurality" means two or more.
  • words such as “exemplary” or “for example” are used as examples, illustrations or illustrations. Any embodiment or design described as “exemplary” or “for example” in the embodiments of the present disclosure shall not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as “exemplary” or “such as” is intended to present related concepts in a concrete manner.
  • the projected image projected by the projection device on the projection screen may not match the projection screen (for example, the projected image exceeds the border of the projection screen), and the projected image needs to be manually corrected, or the projected image needs to be corrected using a geometric correction function.
  • these correction methods have to be adjusted point by point or feature point by manual adjustment, which is not only time-consuming and laborious, but also brings extremely poor viewing experience to users.
  • FIG. 1A is a schematic diagram of a projection system according to some embodiments of the present disclosure.
  • the projection system includes: a projection device 10 , a projection screen 20 , a control device 30 and a server 40 .
  • the user can control the projection device 10 to project on the projection screen 20 through the control device 30 , and the server 40 can provide various contents and interactions to the projection device 10 .
  • the control device 30 can be a remote controller 30A, which can communicate with the projection device 10 through infrared protocol communication, Bluetooth protocol communication, ZigBee protocol communication or other short-distance communication methods for The projection device 10 is controlled by wireless or other wired means.
  • the user can control the projection device 10 by inputting user instructions through buttons on the remote control 30A, voice input, control panel input, etc.
  • the user can input corresponding control commands through the volume plus and minus keys, channel control keys, up/down/left/right movement keys, voice input keys, menu keys, power on and off keys, etc. on the remote controller 30A to realize the projection device 10 function.
  • the control device 30 can also be an intelligent device, such as a mobile terminal 30B, a tablet computer, a computer, a notebook computer, etc., which can be connected through a local network (LAN, Local Area Network), a wide area network (WAN, Wide Area Network), a wireless local area network (WLAN, Wireless Local Area Network) or other networks communicate with the multimedia controller, and realize the control of the projection device 10 through the application program corresponding to the multimedia controller.
  • LAN Local Area Network
  • WAN Wide Area Network
  • WLAN Wireless Local Area Network
  • the application can provide users with various controls through an intuitive user interface (UI, User Interface) on the screen associated with the smart device.
  • both the mobile terminal 30B and the projection device 10 can be installed with software applications, so that the connection and communication between the two can be realized through the network communication protocol, and then the purpose of one-to-one control operation and data communication can be realized.
  • the mobile terminal 30B can establish a control command protocol with the projection device 10
  • the remote control keyboard can be synchronized to the mobile terminal 30B, and the function of controlling the multimedia controller can be realized by controlling the user interface on the mobile terminal 30B
  • the audio and video content displayed on the screen is transmitted to the projection device 10 to realize the synchronous display function.
  • the server 40 can be a video server, an electronic program guide (EPG, Electronic Program Guide) server, a cloud server, and the like.
  • EPG Electronic Program Guide
  • the projection device 10 can perform data communication with the server 40 through various communication methods.
  • the projection device 10 may be allowed to perform a wired communication connection or a wireless communication connection with the server 40 through a local area network, a wireless local area network or other networks.
  • projection device 10 interacts with the EPG by sending and receiving messages, receiving software program updates, or accessing a remotely stored digital media library.
  • the servers 40 may be one group or multiple groups, and may be one or more types of servers. Other network service contents such as video on demand and advertisement service are provided through the server 40 .
  • the light source assembly 100 is configured to provide an illumination beam (laser beam).
  • the optical machine 200 is configured to use an image signal to modulate the illumination beam provided by the light source assembly 100 to obtain a projection beam.
  • the lens 300 is configured to project the projection beam onto a projection screen or a wall for imaging.
  • the light source assembly 100 , the light engine 200 and the lens 300 are sequentially connected along the beam propagation direction, and each is wrapped by a corresponding housing.
  • the housings of the light source assembly 100 , the optical engine 200 and the lens 300 support the optical components and make the optical components meet certain sealing or airtight requirements.
  • the light source assembly 100 is airtightly sealed through its corresponding housing, which can better improve the problem of light decay of the light source assembly 100 .
  • One end of the optical engine 200 is coupled to the lens 300 and arranged along a first direction X of the whole machine, for example, the first direction X may be the width direction of the whole machine.
  • the other end of the optical machine 200 is coupled with the light source assembly 100 .
  • the connection direction between the light source assembly 100 and the optical machine 200 is perpendicular to the connection direction between the optical machine 200 and the lens 300.
  • this connection structure can adapt to the optical path characteristics of the reflective light valve in the optical machine 200, and on the other hand On the one hand, it is also beneficial to shorten the length of the optical path in one dimension, which is beneficial to the structural arrangement of the whole machine.
  • the length of the optical path in this direction will be Very long, which is not conducive to the structural arrangement of the whole machine.
  • light source assembly 100 may include three laser arrays.
  • Fig. 2 is a schematic diagram of a light source assembly, an optical machine, and a lens in a projection device according to some embodiments of the present disclosure.
  • the light source assembly 100 is an example of a three-color laser light source, and the three laser arrays may be red lasers respectively array 130, green laser array 120, and blue laser array 110; but not limited thereto.
  • the three laser arrays may also all be blue laser arrays 110 , or two laser arrays may be blue laser arrays 110 , and one laser array may be red laser arrays 130 .
  • the light source assembly 100 can generate an illumination beam containing light of the three primary colors, so there is no need to set a fluorescent wheel in the light source assembly 100 (when one or more lasers included in the light source
  • the array can only generate one or two colors of laser light, it is necessary to use the existing color laser to excite the fluorescent wheel to generate other colors of fluorescent light, so that the laser light and the fluorescent light together form white light
  • the volume of the light source assembly 100 is small.
  • the light source assembly 100 may also include two laser arrays.
  • the light source assembly 100 is a two-color laser light source as an example.
  • the two laser arrays can be a blue laser array 110 and a red laser array 130;
  • the light source assembly 100 can also include a laser array, that is, the light source assembly 100 is a monochromatic laser light source, that is, the light source assembly 100 only includes the blue laser array 110, or only includes the blue laser array 110 and the red laser array 130 pm.
  • FIG. 4 is a schematic diagram of the optical path principle of the light source assembly in the projection device according to some embodiments of the present disclosure.
  • FIG. Round 150 After the blue laser 110 emits blue light, a part of the blue light is irradiated on the fluorescent wheel 140 to generate red fluorescent light (when the light source assembly 100 includes the red laser array 130, it is not necessary to generate red fluorescent light) and green fluorescent light; , red fluorescent light (or red laser) and green fluorescent light sequentially pass through the light combining mirror 160 and then pass through the color filter wheel 150 for color filtering, and output the three primary colors sequentially.
  • red fluorescent light or red laser
  • green fluorescent light sequentially pass through the light combining mirror 160 and then pass through the color filter wheel 150 for color filtering, and output the three primary colors sequentially.
  • the human eye cannot distinguish the color of light at a certain moment, and what it perceives is still mixed white light.
  • FIG. 3 is a schematic diagram of an optical path structure in a projection device according to some embodiments of the present disclosure.
  • DMD Digital Micromirror Device
  • the light pipe 210 can receive the illumination beam of the light source assembly 100 and homogenize the illumination beam.
  • the lens assembly 220 can amplify the illumination light beam first, then converge it and output it to the reflector 230 .
  • the mirror 230 can reflect the illumination beam to the prism assembly 250 .
  • the prism assembly 250 reflects the illumination beam to the DMD 240, and the DMD 240 modulates the illumination beam, and reflects the modulated projection beam to the lens 300.
  • the DMD 240 is the core component, and its function is to use the image signal to modulate the illumination beam of the light source assembly 100, that is, to control the illumination beam to display different colors and brightness for different pixels of the image to be displayed, so as to finally form an optical image, so the DMD 240 is also known as a light modulation device or light valve.
  • the light modulation device or light valve
  • the light modulation device can be divided into a transmissive light modulation device (or light valve) or a reflective light modulation device (or light valve).
  • the DMD 240 reflects the illumination beam, which is a reflective light modulation device.
  • the liquid crystal light valve transmits the illumination beam, so it is a transmissive light modulation device.
  • the optomechanics can be divided into single-chip systems, two-chip systems or three-chip systems.
  • the optical machine 200 can be called a single-chip system.
  • the optical machine 200 can be called a three-chip system.
  • the DMD 240 is applied in the digital light processing (Digital Light Processing, DLP) projection architecture, as shown in Figure 2 and Figure 3, the optical machine 200 uses the DLP projection architecture.
  • FIG. 5 is an arrangement structure diagram of tiny reflective mirrors in a digital micromirror device according to some embodiments of the present disclosure. As shown in FIG. 5 , DMD 240 includes thousands of tiny reflective mirrors 2401 that can be individually driven to rotate, These tiny mirrors 2401 are arranged in an array, and each tiny mirror 2401 corresponds to a pixel in the image to be displayed.
  • each tiny reflector 2401 is equivalent to a digital switch, which can swing within the range of plus or minus 12 degrees ( ⁇ 12°) or plus or minus 17 degrees ( ⁇ 17°) under the action of an external electric field, to The reflected light can be imaged on the screen through the lens 300 along the optical axis to form a bright pixel.
  • FIG. 6 is a schematic diagram of the operation of the micro-mirror mirror according to some embodiments of the present disclosure.
  • the light reflected by the micro-reflector 2401 at a negative deflection angle is called OFF light, and the OFF light is invalid light. It hits the housing 101 of the whole machine, the housing of the optical machine 200 or the light absorbing unit to absorb it.
  • the light reflected by the tiny reflective lens 2401 at a positive deflection angle is called ON light.
  • the ON light is the effective light beam that the tiny reflective lens 2401 on the surface of the DMD 240 receives the illumination beam and enters the lens 300 through a positive deflection angle.
  • the open state of the micro-reflector 2401 is the state where the micro-reflector 2401 is and can be maintained when the illumination beam emitted by the light source assembly 100 is reflected by the micro-reflector 2401 and can enter the lens 300, that is, the micro-reflector 2401 is at a positive deflection angle status.
  • the closed state of the tiny reflective mirror 2401 is the state where the tiny reflective mirror 2401 is and can be maintained when the illuminating light beam emitted by the light source assembly 100 is reflected by the tiny reflective mirror 2401 and does not enter the lens 300, that is, the tiny reflective mirror 2401 is in a negative deflection angle status.
  • FIG. 7 is a schematic diagram of the swinging position of a tiny mirror in the digital micromirror device shown in FIG. 5. As shown in FIG. That is, the on state, the state at -12° is the off state, and for the deflection angle between -12° and +12°, the actual working state of the tiny mirror 2401 is only the on state and the off state.
  • the state at +17° is the on state
  • the state at -17° is the off state.
  • the image signal is converted into digital codes such as 0 and 1, and these digital codes can drive the tiny mirror 2401 to swing.
  • part or all of the tiny mirrors 2401 will be switched once between the on state and the off state, so as to realize the display in one frame of image according to the duration time of the tiny mirrors 2401 respectively in the on state and the off state.
  • the gray scale of each pixel of For example, when a pixel has 256 gray scales from 0 to 255, the tiny mirrors corresponding to gray scale 0 are in the off state during the entire display period of one frame of image, and the tiny mirrors corresponding to gray scale 255 are in the off state during one frame.
  • the whole display period of the image is in the on state, and the tiny reflective mirror corresponding to the gray scale 127 is in the on state for half of the time in the display period of a frame of image, and the other half of the time is in the off state. Therefore, the state and the maintenance time of each state in the display period of a frame image are controlled by the image signal of each tiny reflective mirror in the DMD 240, and the brightness (gray scale) of the corresponding pixel of the tiny reflective mirror 2401 can be controlled to realize the control of the image.
  • the purpose of modulation of the illumination beam projected to the DMD 240 is controlled by the image signal of each tiny reflective mirror in the DMD 240, and the brightness (gray scale) of the corresponding pixel of the tiny reflective mirror 2401 can be controlled to realize the control of the image.
  • the light guide 210 at the front end of the DMD 240, the lens assembly 220 and the reflector 230 form an illumination light path, and the illumination beam emitted by the light source assembly 100 passes through the illumination light path to form a beam size and an incident angle that meet the requirements of the DMD 240.
  • the lens 300 includes a combination of multiple lenses, which are generally divided into groups, such as three-stage front group, middle group and rear group, or two-stage front group and rear group.
  • the front group is the lens group near the light output side of the projection device (left side shown in FIG. 2 )
  • the rear group is the lens group near the light output side of the light engine 200 (right side shown in FIG. 2 ).
  • the lens 300 may also be a zoom lens, or a fixed focus adjustable focus lens, or a fixed focus lens.
  • the laser projection device is an ultra-short-focus projection device
  • the lens 300 is an ultra-short-focus lens
  • the throw ratio of the lens 300 is usually less than 0.3, such as 0.24.
  • the throw ratio refers to the ratio of the projection distance to the screen width. The smaller the ratio, the larger the projection screen width at the same projection distance.
  • the ultra-short-focus lens with a relatively small projection can adapt to a narrow space while ensuring the projection effect.
  • the projection device 10 further includes a circuit system architecture 400 and a detection device 600.
  • the circuit system architecture 400 includes a first controller 401, a second controller 402, a power supply circuit 403, and a light source driving circuit. 404 and light valve drive circuit 405.
  • the power circuit 403 is coupled with the light valve driving circuit 405 , the light source driving circuit 404 and the second controller 402 , and is used for supplying power to the light valve driving circuit 405 , the light source driving circuit 404 and the second controller 402 .
  • the first controller 401 is configured to send a standby instruction to the second controller 402 in response to the standby operation, and control the power supply circuit 403 to keep the state of supplying power to the second controller 402 unchanged.
  • the second controller 402 is configured to control the power supply circuit 403 to maintain the state of supplying power to the light valve driving circuit 405 in response to the standby command, and control the power supply circuit 403 to stop supplying power to the light source driving circuit 404 .
  • the standby operation may be a click operation on a standby button in a remote controller used to control the projection device 10 , or a click operation on a standby button on a housing of the projection device 10 .
  • the first controller 401 may be a system-on-chip (System on Chip, SoC), and the second controller 402 may be a display control chip, such as a DLP chip.
  • SoC System on Chip
  • the first controller 401 and the second controller 402 may also be integrated into one chip.
  • the first controller 401 and the second controller 402 are two chips respectively, the first controller 401 is coupled to the second controller 402 .
  • the detection device 600 is configured to detect whether there is a target object within the target range, and generate a detection signal based on the detection result.
  • FIG. 9 is a structural diagram of another projection device according to some embodiments of the present disclosure.
  • the detection device 600 is located outside the housing of the projection device 10 .
  • the detection device 600 may be located on the side of the casing of the projection device 10 , and the plane of the side intersects the plane of the projection screen 20 .
  • the detection device 600 may be located on the side of the housing of the projection device 10 away from the projection screen 20 .
  • the detection device 600 may include at least one of a millimeter wave sensor, a pyroelectric infrared sensor, and a camera, and the embodiment of the present disclosure does not limit the type and location of the detection device 600 .
  • the detection device 600 may periodically or in real time detect whether there is a target object within the target range, and generate a detection signal based on the detection result.
  • the detection signal is used to indicate whether there is a target object in the target range, and the target object may be a person within the detection range of the detection device 600 .
  • the target range may be the detection range of the detection device 600 , or the target range may be a fixed range pre-stored in the detection device 600 , and the target range is within the detection range of the detection device 600 .
  • the detection device 600 may include a millimeter wave sensor, and the detection device 600 may emit a millimeter wave signal, and determine whether there is a target object within the target range according to the millimeter wave signal reflected by the target object.
  • the detection device 600 can determine the position of the target object based on the millimeter wave signal reflected by the target object, and detect whether the position of the target object is within the target range.
  • the position of the target object may include a target distance between the target object and the detection device 600 and an azimuth of the target object.
  • the detection device 600 can determine a difference signal according to the received millimeter wave signal, and determine the target distance between the target object and the detection device 600 according to the peak frequency of the difference signal. Moreover, the detection device 600 can determine the azimuth angle of the target object according to the difference between the phase angles of two adjacent difference signals.
  • the detection device 600 may include a pyroelectric infrared sensor, which can detect an infrared signal radiated by a target object, and determine whether there is a target object within the target range according to the detected infrared signal radiated by the target object .
  • the detection device 600 can amplify the detected infrared signal, convert the amplified infrared signal into an electrical signal, and detect whether the amplitude of the electrical signal is greater than the amplitude value threshold. If the detection result is that the amplitude of the electrical signal is greater than or equal to the amplitude threshold, it is determined that there is a target object within the target range. If the detection result is that the amplitude of the electrical signal is smaller than the amplitude threshold, the detection device 600 determines that there is no target object within the target range.
  • the amplitude threshold may be a fixed value pre-stored in the detection device 600 .
  • the detection device 600 may include a camera, and if the target range is within the detection range of the detection device 600 , the detection device 600 may detect whether there is a target object in the image captured by it.
  • the detection device 600 can detect the ratio of the area occupied by the target object in the captured image to the area of the captured image. If the detection result is that the ratio is greater than or equal to the ratio threshold, it is determined that the target object exists within the target range. If the ratio is smaller than the ratio threshold, the detection device 600 determines that there is no target object within the target range.
  • the ratio threshold may be a fixed value pre-stored in the detection device 600 .
  • the detection device 600 If there is a target object within the target range, the detection device 600 generates a detection signal for indicating that the target object exists within the target range. If there is no target object within the target range, the detection device 600 generates a detection signal for indicating that there is no target object within the target range.
  • the detection device 600 may be coupled to the first controller 401 and may also be coupled to the second controller 402 .
  • the first controller 401 when the detection device 600 is coupled with the first controller 401, the first controller 401 sends a signal acquisition instruction to the detection device 600 in response to the standby operation, and the detection device 600, after receiving the signal acquisition instruction, In response to the signal acquisition instruction, the generated detection signal is sent to the first controller 401 .
  • the first controller 401 sends the detection signal to the second controller 402 .
  • the second controller 402 when the detection device 600 is coupled with the second controller 402, the second controller 402 sends a signal acquisition instruction to the detection device 600 in response to the standby instruction, and the detection device 600, after receiving the signal acquisition instruction, In response to the signal acquisition instruction, the generated detection signal is sent to the second controller 402 .
  • the second controller 402 determines that there is a target object in the target range based on the detection signal, it controls the power supply circuit 403 to supply power to the light source driving circuit 404 and sends an image signal of the standby image to the light valve driving circuit 405 .
  • An embodiment of the present disclosure provides a projection device 10.
  • the second controller 402 determines that there is a target object within the target range based on the detection signal, it controls the power supply circuit 403 to supply power to the light source drive circuit 404. , and send a projection signal to the light valve driving circuit 405 , so that the light valve driving circuit 405 projects and displays the standby screen on the projection screen 20 . That is, when the projection device 10 is in the standby state, it can project and display the standby screen on the projection screen 20 by detecting that there is a target object within the target range, thereby effectively enriching the functions of the projection device 10 .
  • the second controller 402 is further configured to send a current driving signal to the light source driving circuit 404, and the light source driving circuit 404 is configured to send a driving current to the light source assembly 100 in response to the current driving signal, and the light source assembly 100 uses The light beam is emitted under the driving of the driving current.
  • the standby image is an image pre-stored in the light valve driving circuit 405 .
  • the second controller 402 is further configured to determine that the target object exists within the target range based on the detection signal, send an image request signal to the first controller 401 , and send a standby image to the light valve driving circuit 405 .
  • the image request signal is used to instruct the first controller 401 to send the pre-stored standby image to the second controller 402 .
  • the first controller 401 is further configured to send a pre-stored standby image to the second controller 402 in response to the image request signal.
  • the first controller 401 is configured to: receive a video switching instruction; send a black field video to the second controller 402 in response to the video switching instruction, the black field video includes a plurality of black frames and a plurality of positioning frames , the positioning frame is used to assist the projection device 10 in image correction.
  • the second controller 402 is coupled to the light source assembly 100 and the optical machine 200 and configured to receive the black field video and control the light source assembly 100 and the optical machine 200 to play the black field video.
  • the standby image may be an image frame in a black field video, for example, a black frame and/or an alignment frame.
  • FIG. 10 is a structural diagram of another projection device according to some embodiments of the present disclosure.
  • the first controller 401 includes a wake-up circuit 4011 and a slave control circuit 4012 .
  • the wake-up circuit 4011 is coupled to the slave control circuit 4012 and the second controller 402 .
  • the wake-up circuit 4011 is configured to send a standby instruction to the second controller 402 in response to the standby operation, and control the power supply circuit 403 to stop supplying power to the slave control circuit 4012; wherein, the slave control circuit 4012 is configured to send a command to the second controller 402 Control instruction.
  • the second controller 402 is configured to control the power supply circuit 403 to maintain the state of supplying power to the light valve driving circuit 405 in response to the standby command, and control the power supply circuit 403 to stop supplying power to the light source driving circuit 404 .
  • the wake-up circuit 4011 and the slave control circuit 4012 are integrated on the first controller 401, and when the projection device is in a standby state, the power supply circuit 403 keeps powering the second controller 402 and the wake-up circuit 4011 unchanged. That is, when the projection device 10 is in the standby state, except the wake-up circuit 4011 in the first controller 401 is in the working state, other circuits in the first controller 401 (such as the slave control circuit 4012 ) are all in the non-working state.
  • the slave control circuit 4012 is configured to send a control instruction to the second controller 402 when it is in a working state.
  • the second controller 402 may respond to the control instruction and control the power supply circuit 403 to supply power to the light source driving circuit 404 and the light valve driving circuit 405 .
  • the control instruction may carry a projected image to be displayed, and the second controller 402 may send the projected image to be displayed to the light valve drive circuit 405 in response to the control command, so that the light valve drive circuit 405 will The projected image to be displayed is projected and displayed on the projection screen 20 .
  • the power circuit 403 includes a power board 4031 and a first switch circuit 4032 , and the first switch circuit 4032 is coupled to the power board 4031 , the second controller 402 and the wake-up circuit 4011 respectively.
  • the wake-up circuit 4011 is further configured to control the first switch circuit 4032 to maintain a conductive state in response to the standby operation, so that the power board 4031 continues to supply power to the second controller 402 .
  • the power supply circuit 403 keeps the state of supplying power to the second controller 402 unchanged.
  • the control terminal of the first switch circuit 4032 is coupled to the wake-up circuit 4011 , the input terminal of the first switch circuit 4032 is coupled to the power board 4031 , and the output terminal of the first switch circuit 4032 is coupled to the second controller 402 .
  • the first switch circuit 4032 can be a switch, and the wake-up circuit 4011 is also used to continuously send an enable signal whose level is an active level to the control terminal of the first switch circuit 4032 in response to the standby operation, thereby enabling The first switch circuit 4032 remains on.
  • the wake-up circuit 4011 may be provided with multiple general purpose input/output (General Purpose Input/Output, GPIO) GPIO ports.
  • the first switch circuit 4032 may be coupled to the first GPIO port among the multiple GPIO ports provided on the wake-up circuit 4011 .
  • the wake-up circuit 4011 may also be coupled to the second controller 402 through a second GPIO port among the plurality of GPIO ports, and send a standby instruction to the second controller 402 through the second GPIO port.
  • FIG. 11 is a structural diagram of another projection device according to some embodiments of the present disclosure.
  • the second controller 402 is directly coupled to the power board 4031 , and the power board 4031 can continuously supply power to the second controller 402 when the projection device is in a standby state.
  • the GPIO ports that can be set on the wake-up circuit 4011 are limited, and the wake-up circuit 4011 needs to respond to the standby operation, and control the power supply circuit 403 through other GPIO ports to stop supplying power to the slave control circuit 4012, the remote control module in the projection device, etc. .
  • the second controller 402 By directly coupling the second controller 402 to the power board 4031 , it is possible to effectively avoid the situation that the wake-up circuit 4011 has limited GPIO ports and no extra GPIO ports on the wake-up circuit 4011 are coupled to the first switch circuit 4032 . Therefore, it is effectively ensured that when the projection device is in a standby state, the power supply circuit 403 remains in a state where it can supply power to the second controller 402 .
  • the power supply circuit 403 may further include a second switch circuit 4033 , a third switch circuit 4034 and a fourth switch circuit 4035 .
  • the second switch circuit 4033 , the third switch circuit 4034 and the fourth switch circuit 4035 can all be switches.
  • the second switch circuit 4033 is respectively coupled to the power board 4031, the wake-up circuit 4011 and the slave control circuit 4012.
  • the wake-up circuit 4011 is used to control the second switch circuit 4033 to disconnect in response to the standby operation, so that the power board 4031 stops being a slave control circuit.
  • Circuit 4012 provides power.
  • the control terminal of the second switch circuit 4033 is coupled to the wake-up circuit 4011 , the input terminal of the second switch circuit 4033 is coupled to the power board 4031 , and the output terminal of the second switch circuit 4033 is coupled to the slave control circuit 4012 .
  • the wake-up circuit 4011 is configured to send an enable signal at an inactive level to the control terminal of the second switch circuit 4033 in response to the standby operation, thereby turning off the second switch circuit 4033 .
  • the wake-up circuit 4011 may be coupled to the control terminal of the second switch circuit 4033 through the third GPIO port among the plurality of GPIO ports configured by the wake-up circuit 4011 .
  • the third switch circuit 4034 is respectively coupled to the power board 4031, the second controller 402 and the light valve drive circuit 405, and the second controller 402 is used to control the third switch circuit 4034 to maintain a conduction state in response to the standby command, so that the power board 4031 continuously supplies power to the light valve driving circuit 405 .
  • the control terminal of the third switch circuit 4034 is coupled to the second controller 402, the input terminal of the third switch circuit 4034 is coupled to the power board 4031, and the output terminal of the third switch circuit 4034 is coupled to the light valve driving circuit 405. catch.
  • the second controller 402 is configured to continuously send an enable signal with an active level to the control terminal of the third switch circuit 4034 in response to the standby instruction, thereby keeping the third switch circuit 4034 in a conducting state.
  • the fourth switch circuit 4035 is respectively coupled to the power board 4031, the second controller 402 and the light source driving circuit 404, and the second controller 402 is used to control the fourth switch circuit 4035 to be disconnected in response to the standby command, so that the power board 4031 stops To supply power to the light source driving circuit 404 , and if it is determined based on the detection signal that there is a target object within the target range, the fourth switch circuit 4035 can be controlled to turn on, so that the power supply board 4031 supplies power to the light source driving circuit 404 .
  • the control terminal of the fourth switch circuit 4035 is coupled to the second controller 402, the input terminal of the fourth switch circuit 4035 is coupled to the power board 4031, and the output terminal of the fourth switch circuit 4035 is coupled to the light source driving circuit 404 .
  • the second controller 402 is configured to send an enable signal at an inactive level to the control terminal of the fourth switch circuit 4035 in response to the standby instruction, thereby controlling the fourth switch circuit 4035 to be turned off. If the second controller 402 determines that there is a target object in the target range based on the detection signal, it can send an enabling signal whose level is an active level to the control terminal of the fourth switch circuit 4035, thereby controlling the fourth switch circuit 4035 to lead Pass.
  • the projection device 10 further includes a heat dissipation assembly 1000 coupled to the second controller 402 .
  • the second controller 402 is further configured to control the power supply circuit 403 to stop supplying power to the cooling assembly 1000 in response to the standby instruction. If it is determined based on the detection signal that there is a target object within the target range, the power supply circuit 403 is controlled to supply power to the cooling assembly 1000 .
  • FIG. 11 is a structural diagram of another projection device according to some embodiments of the present disclosure.
  • the second controller 402 is directly coupled to the power board 4031 , and the power board 4031 can continuously supply power to the second controller 402 when the projection device is in a standby state.
  • the power circuit 403 may further include a fifth switch circuit 4036 , and the fifth switch circuit 4036 is respectively coupled to the power board 4031 , the second controller 402 and the cooling assembly 1000 .
  • the second controller 402 is also used to control the fifth switch circuit 4036 to turn off in response to the standby command, so that the power board 4031 stops supplying power to the cooling assembly 1000, and if it is determined based on the detection signal that there is a target object in the target range, then control the fifth switch circuit 4036 to turn off.
  • the five-switch circuit 4036 is turned on, so that the power board 4031 supplies power to the cooling assembly 1000 .
  • the control terminal of the fifth switch circuit 4036 is coupled to the second controller 402 , the input terminal of the fifth switch circuit 4036 is coupled to the power board 4031 , and the output terminal of the fifth switch circuit 4036 is coupled to the cooling assembly 1000 .
  • the second controller 402 is configured to send an enable signal at an inactive level to the control terminal of the fifth switch circuit 4036 in response to the standby command, thereby turning off the fifth switch circuit 4036 . If the second controller 402 determines that there is a target object in the target range based on the detection signal, it can send an enabling signal whose level is an active level to the control terminal of the fifth switch circuit 4036, thereby controlling the fifth switch circuit 4036 to turn on Pass.
  • the second controller 402 may also send a driving signal to the heat dissipation assembly 1000, thereby making the heat dissipation assembly 1000 work under the drive of the driving signal.
  • the wake-up circuit 4011 receives a video switching instruction, controls the power supply circuit 403 to supply power to the slave control circuit 4012, and supplies power to the slave control circuit 4012.
  • Circuit 4012 sends the video switching command.
  • the slave control circuit 4012 receives and responds to the video switching instruction, and sends the black scene video to the second controller 402 .
  • the video switching instruction is used to instruct the projection screen on the projection screen 20 to switch from the current projection screen to a preset projection screen.
  • the video switching instruction may be a button instruction issued by the user by pressing a button on the remote control, or a voice instruction, or an instruction issued by the user through a terminal device coupled to the projection device 10 . Embodiments of the present disclosure do not limit this.
  • the video switching instruction may be switching signal channels, switching image modes, opening a USB flash drive, switching video channels, and other instructions that need to switch the current projection screen.
  • the current signal channel of the projection device 10 is HDMI1
  • the video switching instruction may be used to instruct to switch the signal channel from HDMI1 to HDMI2.
  • the black field video refers to a video whose picture is completely black.
  • the black field video includes at least one black frame and at least one positioning frame, and the embodiments of the present disclosure make no limitation on the number of black frames and the number of positioning frames included in the black field video.
  • a black frame represents a completely black, low-brightness image frame. That is, the color of all pixels on the black frame is black.
  • a localization frame includes one or more feature points. Wherein, a feature point may be formed by positioning multiple adjacent pixel points on the frame. That is, a feature point may be a correction mark, and the correction mark may include multiple adjacent pixel points.
  • the color of the first pixel on the positioning frame is not black (for example, it can be is white or other colors), and the color of the second pixel is black.
  • the first pixel point is a pixel point used to form a feature point on the positioning frame
  • the second pixel point is other pixel points on the positioning frame except the first pixel point.
  • FIG. 12 is a schematic diagram of a black frame and an alignment frame according to some embodiments of the present disclosure.
  • the video frame shown in (a) in FIG. 12 is a black frame.
  • the video frame shown in (b) in Fig. 12 is a positioning frame, and this positioning frame includes 4 circular feature points K1-K4, and the color of the first pixel point included in each feature point in the positioning frame is white, and the feature The color of the second pixel point other than the point is black.
  • Embodiments of the present disclosure do not limit the specific color of the black frame, for example, it may also be gray.
  • the embodiment of the present disclosure does not limit the specific color of the second pixel on the positioning frame, and it only needs to keep the color of the second pixel consistent with the color of the black frame.
  • the positioning frame includes one or more feature points, and the number of feature points included in different positioning frames may be the same or different.
  • the positions of the multiple feature points in the positioning frame are different.
  • image correction requires K feature points as an example, and K is an integer greater than 1.
  • the K feature points may be located on one positioning frame, or may be respectively located on multiple positioning frames. This disclosure is not limited to this.
  • each positioning frame in the multiple positioning frames includes a part of the K feature points, and the positions of the feature points in different positioning frames can be the same or different. .
  • each of the M positioning frames may include multiple feature points, where M is an integer greater than 1.
  • FIG. 13 is a schematic diagram of a positioning frame according to some embodiments of the present disclosure. As shown in FIG. 13 , there is a feature point K1 in the upper left corner of each positioning frame in a black field video, a feature point K2 in the upper right corner, and a feature point K2 in the lower left corner. There is a feature point K3 in the corner and a feature point K4 in the lower right corner, that is, each positioning frame includes 4 feature points in different positions.
  • FIG. 14 is a schematic diagram of another positioning frame according to some embodiments of the present disclosure.
  • the M positioning frames at least include a first positioning frame, a second positioning frame, a third positioning frame and a fourth positioning frame. frame.
  • the multiple feature points may also be respectively located on multiple different positioning frames, and each positioning frame includes two feature points.
  • FIG. 15 is a schematic diagram of another positioning frame according to some embodiments of the present disclosure.
  • the M positioning frames include at least a fifth positioning frame and a sixth positioning frame.
  • the fifth positioning frame includes the feature point K1 in the upper left corner and the feature point K2 in the lower left corner
  • the sixth positioning frame includes the feature point K3 in the upper right corner and the feature point K4 in the lower right corner
  • the positions of the feature points in the sixth positioning frame are different. That is, the feature points included in the at least two positioning frames are respectively located at different positions in the at least two positioning frames.
  • the embodiment of the present disclosure does not limit the shape of the feature points and the setting manner of the feature points in the positioning frame.
  • the number of feature points that need to be carried on one positioning frame can be reduced.
  • the difference between the positioning frame and the black frame can be reduced, thereby effectively reducing the possibility that the user perceives the positioning frame when watching a black field video.
  • video frames adjacent to the anchor frame are black frames.
  • the second controller 402 controls the light source driving circuit 404 to drive the light source assembly 100 to provide an illumination beam
  • the second controller 402 controls the light valve driving circuit 405 to drive the light machine 200 to utilize black light.
  • the image signal in the field video modulates the illumination beam to obtain a projection beam
  • the lens 300 projects the projection beam into an image.
  • the projection device 10 is playing black video, it may alternately project the positioning frame and the black frame on the projection screen 20 .
  • the second controller 402 first projects at least one black frame to the projection screen 20, then projects one frame of positioning frame to the projection screen 20, then projects at least one black frame to the projection screen 20, and then projects one frame to the projection screen 20 positioning frames, and so on. That is, the second controller 402 can project multiple positioning frames to the projection screen 20 , and there is at least one black frame between two adjacent positioning frames, so as to realize alternate projection of positioning frames and black frames.
  • the number of black frames in the black video is greater than or equal to the number of anchor frames. For example, taking the number of frames per second of a black field video as 30 as an example, 15 video frames are black frames, and 15 frames are positioning frames. For another example, the number of frames per second of the black field video is 60, among 15 consecutive video frames in the black field video, 14 video frames are black frames, and 1 video frame is an alignment frame. In this way, when the black video is played, most of the video frames that the user sees are black frames, and a small part of the video frames are positioning frames, which can reduce the possibility of the user perceiving the positioning frames. Moreover, by projecting the positioning frame and the black frame alternately, it is possible to prevent the positioning frame from staying in the user's vision for too long, and reduce the possibility that the user perceives the positioning frame when watching a black field video.
  • the black scene video in the embodiments of the present disclosure may be pre-generated before the projection device receives the video switching instruction, or may be generated in real time by the projection device after receiving the video switching instruction, or may be generated by the projection device after leaving the factory. pre-configured.
  • the black field video in the embodiment of the present disclosure is improved and generated on the basis of the video to be processed.
  • the video to be processed includes multiple black frames, and any black frame in the multiple black frames may be the first black frame.
  • the video to be processed only includes black frames and does not include anchor frames. The manner in which the first controller 401 acquires black video is introduced below.
  • the first controller 401 is further configured to: add feature points to the first black frame included in the video to be processed to obtain a positioning frame, and replace the first black frame with the positioning frame to obtain a black field video.
  • the video to be processed includes one or more first black frames, and the number of first black frames included in the video to be processed is the same as the number of positioning frames included in the black video.
  • Fig. 16 is a schematic diagram of the composition of a black field video according to some embodiments of the present disclosure. As shown in Fig.
  • the video to be processed includes five black frames from black frame P1 to black frame P5 as an example, and the video to be processed can be selected
  • the third black frame P3 is used as the first black frame, and four feature points are added to the upper left corner, lower left corner, upper right corner and lower right corner of the first black frame, that is, the black frame P3 to obtain the positioning frame L1, and the positioning frame is used L1 replaces the first black frame P3 to obtain a black field video.
  • the black field video includes multiple first black frames
  • the multiple first black frames in the video to be processed may be replaced with positioning frames to obtain a black field video including multiple positioning frames.
  • the first controller 401 is further configured to: add feature points to the first black frame included in the video to be processed to obtain a positioning frame, and insert the positioning frame before or after the first black frame to obtain a black frame video.
  • FIG. 17 is a schematic composition diagram of another black field video according to some embodiments of the present disclosure.
  • the video to be processed includes three first black frames including black frame P1 to black frame P3
  • a positioning frame is inserted after each first black frame, that is, positioning frame L1 is inserted after black frame P1, positioning frame L2 is inserted after black frame P2, and positioning frame L3 is inserted after black frame P3, resulting in three Locate the black field video of frames L1-L3 and three black frames P1-P3.
  • inserting an anchor frame into the video to be processed can also be understood as performing frame expansion processing on the video to be processed, and inserting an anchor frame every preset number of black frames.
  • the frame rate of the video to be processed is 30Hz, that is, the video to be processed has 30 black frames per second, and a positioning frame is inserted every other black frame in the video to be processed, and the frame rate of the obtained black field video is 60Hz.
  • the projection device 10 may include an image acquisition interface, the first controller 401 is coupled to the image acquisition interface, and the first controller 401 is further configured to: acquire a captured image through the image acquisition interface, and determine according to the captured image
  • the correction parameter is to send the correction parameter to the second controller 402 .
  • the captured image is an image captured when the positioning frame in the black field video is projected onto the projection screen 20 .
  • the image acquisition interface is used to connect a shooting device, and the shooting device may be set on the whole machine casing 101 of the projection device 10, or may also be set at a position outside the whole machine casing 101 of the projection device 10,
  • the present disclosure does not limit the installation position of the photographing device, as long as it can photograph the projection screen 20 .
  • the first controller 401 can acquire images and videos through the image acquisition interface.
  • the first controller 401 sends a photographing instruction to the photographing device through the image acquisition interface, and the photographing device responds to the photographing instruction, photographs the positioning frame projected by the lens 300 on the projection screen 20, obtains the photographed image, and sends the image to the first controller through the image acquisition interface 401 Send the captured image.
  • the photographing device may photograph the projection screen 20 . Therefore, the photographing device can photograph the black frame projected on the projection screen 20 or the positioning frame projected on the projection screen 20 .
  • the photographed images in the implementation of the present disclosure all refer to the images of the positioning frames projected on the projection screen 20 captured by the photographing device.
  • the number and position of feature points included in the positioning frame may be different, the number of captured images used for image correction will also be different. Therefore, the specific implementation of capturing images will be introduced below according to different situations of positioning frames.
  • the captured image may be an image captured when any positioning frame is projected onto the projection screen.
  • the positions of all the feature points on the projection screen can be determined based on one captured image.
  • the captured image includes at least M images, M is the number of positioning frames in the above group of positioning frames, and M is an integer greater than 1. It should be understood that the M images are in one-to-one correspondence with the M positioning frames in a group of positioning frames.
  • the image is obtained by the photographing device photographing the projection screen displaying the positioning frame corresponding to the image. In this way, the positions of all feature points on the projection screen can be determined based on the M images.
  • the black field video includes at least the first positioning frame, the second positioning frame, the Three positioning frames and a fourth positioning frame.
  • the captured images at least include a first image, a second image, a third image and a fourth image.
  • the first image is the image taken when the first positioning frame is projected onto the projection screen
  • the second image is the image taken when the second positioning frame is projected onto the projection screen
  • the third image is the third positioning frame projected onto the projection screen
  • the fourth image is the image taken when the fourth positioning frame is projected onto the projection screen.
  • the black field video includes at least the fifth positioning frame and the sixth positioning frame .
  • the captured images include at least the fifth image and the sixth image.
  • the fifth image is an image captured when the fifth positioning frame is projected onto the projection screen
  • the sixth image is an image captured when the sixth positioning frame is projected onto the projection screen.
  • the first controller 401 determines the location information of the feature points by identifying the feature points in the captured image. And the correction parameters are determined according to the position information of the feature points. Other implementation manners may also be used to determine the correction parameter, and the embodiments of the present disclosure are not limited thereto.
  • the correction parameter refers to the offset direction and offset amount of the feature point on the positioning frame and the feature point on the projection screen 20 .
  • a feature point on the positioning frame corresponds to a pixel area in the projection screen 20, the pixel area corresponding to the feature point in the projection screen 20, and the projection offset on the projection screen 20 relative to the initial projection position of the pixel area Equal to the offset of the feature point.
  • the position information of the feature points is used to reflect the positions of the feature points on the projection screen 20 .
  • the projection screen 20 in the captured image is identified to determine the position of the frame of the projection screen 20 and the positions of the corners of the projection screen 20 . And based on the position of the frame of the projection screen 20 and the positions of the corners of the projection screen 20, a two-dimensional plane coordinate system is established.
  • a two-dimensional plane coordinate system may be pre-established with the left vertex of the projection screen 20 as the origin, the upper side as the X axis, and the left side as the Y axis.
  • the position information of the feature points can be determined according to the relative positions between the feature points and the frame of the projection screen 20 and the relative positions between the feature points and the corner points of the projection screen 20 .
  • the location information of the feature points is the coordinates of the feature points in the above-mentioned two-dimensional plane coordinate system.
  • a captured image includes all feature points
  • all feature points in the captured image may be identified, and then position information of all feature points may be determined. If the captured image includes M images, and each of the M images includes a part of feature points, feature point recognition needs to be performed on each of the M images to determine the position information of the feature points in each image.
  • the second controller 402 is also configured to: correct the image to be projected according to the correction parameters, and transmit the corrected image signal of the image to be projected to the optical machine 200, so that the optical machine 200 uses the corrected image to be projected
  • the image signal of the image modulates the illumination beam to obtain the projection beam.
  • the second controller 402 receives the correction parameters from the first controller 401, and corrects the image to be projected according to the correction parameters.
  • the black field video represents a video with a completely black screen
  • playing the black field video during video switching can prevent the user from finding that the video is switched. Brings the phenomenon of flashing images.
  • the correction parameters can be automatically obtained according to the captured image including the positioning frame, and the image to be corrected is corrected according to the correction parameters, and when playing the black frame video, the user can only see the black frame, but cannot recognize the black frame video
  • the existing positioning frames in the video so as to realize the user's senseless correction in the process of video switching.
  • the second controller 402 can respond to the standby command, control the power supply circuit 403 to keep the state of supplying power to the light valve drive circuit 405 unchanged, and the power supply circuit 403 can keep the second controller 402 and The power supply status of the wake-up circuit 4011 remains unchanged.
  • both the second controller 402 and the light valve driving circuit 405 are in the working state, so when the second controller 402 determines that there is a target object within the target range, it can quickly control the power supply circuit 403 as a light source
  • the driving circuit 404 supplies power and sends a projection signal to the light valve driving circuit 405 , so as to rapidly project and display the standby image on the projection screen 20 .
  • the power supply circuit 403 keeps supplying power to the wake-up circuit 4011 in the first controller 401 , and the power supply circuit 403 stops supplying power to the slave control circuit 4012 in the first controller 401 . Since the power supply circuit 403 does not need to supply power to the slave control circuit 4012 when the projection device 10 is in the standby state, the power consumption of the projection device 10 in the standby state is reduced.
  • Some embodiments of the present disclosure also provide a projection system, which includes the above-mentioned projection device 10 and a projection screen 20 .
  • the light outlet of the projection device 10 faces the projection screen, and emits the light beam to the projection screen 20, and the projection screen 20 is used to reflect the light beam to realize the display of the picture.
  • the projection device 10 may be a laser projection device, or may be a light emitting diode (Light Emitting Diode, LED) projection device. Projection device 10 may also have other names, such as projection host and so on.
  • the projection device 10 may be in the shape of a cuboid, a prism, a sphere, or a desk lamp, which is not limited in this embodiment of the present disclosure, as long as it has a projection function.
  • FIG. 18 is a flow chart of a method for correcting a projected image according to some embodiments of the present disclosure. As shown in FIG. 18 , the method includes Steps S181 to S185.
  • the captured image is an image captured when the anchor frame is projected onto the projection screen.
  • FIG. 19 is a flowchart of another projection image correction method according to some embodiments of the present disclosure. As shown in FIG. 19 , S181 and S182 also include S186 and S187.
  • S186 Add feature points to the first black frame included in the video to be processed to obtain a positioning frame.
  • the video to be processed includes multiple black frames, and the first black frame is any black frame in the multiple black frames.
  • S181 and S182 further include S186 and S188.
  • S186 Add feature points to the first black frame included in the video to be processed to obtain a positioning frame.
  • the video to be processed includes multiple black frames, and the first black frame is any black frame in the multiple black frames.
  • S187 and S188 are two methods for obtaining black field video, either method of S187 and S188 can be used, and both methods can be used simultaneously.
  • An embodiment of the present invention is also a computer-readable storage medium.
  • the computer-readable storage medium includes computer-executable instructions, and when the computer-executable instructions are run on the computer, the computer is made to execute the projection image correction method according to the above-mentioned embodiments.
  • An embodiment of the present invention is also a computer program product, which can be directly loaded into a memory and contains software codes. After being loaded and executed by a computer, the computer program product can realize the projection image correction method of the above-mentioned embodiment.
  • all or part of them may be implemented by software, hardware, firmware or any combination thereof.
  • a software program When implemented using a software program, it may be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer-executable instructions.
  • computer-executed instructions When computer-executed instructions are loaded and executed on a computer, the processes or functions according to the embodiments of the present disclosure are generated in whole or in part.
  • a computer can be a general purpose computer, special purpose computer, computer network, or other programmable device.
  • Computer-executable instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, computer-executable instructions may be (such as coaxial cable, optical fiber, digital subscriber line (Digital Subscriber Line, DSL)) or wireless (such as infrared, wireless, microwave, etc.) to another website site, computer, server or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer, or may contain one or more data storage devices such as servers and data centers that can be integrated with the medium.
  • the usable medium may be a magnetic medium (such as a floppy disk, a hard disk, or a magnetic tape), an optical medium (such as a DVD), or a semiconductor medium (such as a solid state disk (Solid State Disk, SSD)), etc.
  • a magnetic medium such as a floppy disk, a hard disk, or a magnetic tape
  • an optical medium such as a DVD
  • a semiconductor medium such as a solid state disk (Solid State Disk, SSD)

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  • Transforming Electric Information Into Light Information (AREA)

Abstract

Certains modes de réalisation de la présente divulgation concernent un dispositif de projection, comprenant : un ensemble source de lumière, un moteur optique, une lentille et une architecture de système de circuit. L'ensemble source de lumière est configuré pour fournir un faisceau d'éclairage ; le moteur optique est configuré pour moduler le faisceau d'éclairage à l'aide d'un signal d'image de façon à obtenir un faisceau de projection ; la lentille est configurée pour projeter le faisceau de projection aux fins d'imagerie ; et l'architecture de système de circuit est configurée pour commander le fonctionnement de l'ensemble source de lumière et du moteur optique, et comprend : un premier contrôleur, qui est couplé à un second contrôleur et est configuré pour : recevoir une instruction de commutation de vidéo ; et envoyer, en réponse à l'instruction de commutation de vidéo, une vidéo noire au second contrôleur, la vidéo noire comprenant une pluralité de trames noires et une pluralité de trames de positionnement, et les trames de positionnement étant utilisées pour assister le dispositif de projection avec une correction d'image ; et un second contrôleur, qui est couplé à l'ensemble source de lumière et au moteur optique, et est configuré pour recevoir la vidéo noire et commander l'ensemble source de lumière et le moteur optique pour lire la vidéo noire.
PCT/CN2022/102067 2021-07-21 2022-06-28 Dispositif de projection et procédé de correction d'image projetée WO2023000937A1 (fr)

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CN202110825816.8A CN115691365A (zh) 2021-07-21 2021-07-21 激光投影设备及投影显示方法
CN202110825818.7 2021-07-21
CN202111567322.0A CN114339174B (zh) 2021-12-20 2021-12-20 一种投影设备及其控制方法
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011082798A (ja) * 2009-10-07 2011-04-21 Sanyo Electric Co Ltd 投写型映像表示装置
CN110300294A (zh) * 2018-03-22 2019-10-01 卡西欧计算机株式会社 投影控制装置、投影控制方法以及存储介质
CN112165644A (zh) * 2020-09-27 2021-01-01 海信视像科技股份有限公司 一种显示设备及竖屏状态下视频播放方法
CN114339174A (zh) * 2021-12-20 2022-04-12 青岛海信激光显示股份有限公司 一种投影设备及其控制方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011082798A (ja) * 2009-10-07 2011-04-21 Sanyo Electric Co Ltd 投写型映像表示装置
CN110300294A (zh) * 2018-03-22 2019-10-01 卡西欧计算机株式会社 投影控制装置、投影控制方法以及存储介质
CN112165644A (zh) * 2020-09-27 2021-01-01 海信视像科技股份有限公司 一种显示设备及竖屏状态下视频播放方法
CN114339174A (zh) * 2021-12-20 2022-04-12 青岛海信激光显示股份有限公司 一种投影设备及其控制方法

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